92611
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EAS4200C Aircraft Structures I
IN TERM EXAM
In this exam you may use only one 8.5x11” formula page. No calculators are allowed.
Please sign a pledge that you have not violated any of the university honesty provisions
with regards to this exam.
_____________________
1.
(35%) The stress tensor is given as
100
030
002
MPa
a.
Calculate the principal stresses and principal directions.
Since there are no shear stresses in the x, y, z system it is the principal system.
The principal stresses are the values on the diagonal, and the principal
directions are x, y and z.
b.
Young’s modulus is 1 GPa, and Poisson’s ratio is zero. Calculate the
Principal strains and the maximum engineering shear strain.
The principal strains are in the same coordinate system as the principal
stresses. So they are 1, 3 and 2 millistrains (MPa divided by GPa gives you
10
3
. The maximum engineering shear strain can be calculated two ways. We
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 Fall '09
 Kim
 Force, Shear Stress, Shear strain, engineering shear strain

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